US20200043911A1 - Anti-parallel diode device - Google Patents
Anti-parallel diode device Download PDFInfo
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- US20200043911A1 US20200043911A1 US16/522,677 US201916522677A US2020043911A1 US 20200043911 A1 US20200043911 A1 US 20200043911A1 US 201916522677 A US201916522677 A US 201916522677A US 2020043911 A1 US2020043911 A1 US 2020043911A1
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- 239000004065 semiconductor Substances 0.000 claims abstract description 533
- 238000005516 engineering process Methods 0.000 claims description 13
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 claims description 2
- 239000012212 insulator Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 7
- 230000005611 electricity Effects 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 5
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- 238000004519 manufacturing process Methods 0.000 description 2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0248—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection
- H01L27/0251—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices
- H01L27/0255—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices using diodes as protective elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0248—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection
- H01L27/0251—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices
- H01L27/0259—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices using bipolar transistors as protective elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/046—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere responsive to excess voltage appearing at terminals of integrated circuits
Definitions
- This invention relates to a voltage clamping device, and more particularly to an anti-parallel diode device.
- FIG. 1 is a schematic circuit diagram of an anti-parallel diode device 200 .
- the anti-parallel diode device 200 includes diodes 207 - 212 .
- the anti-parallel diode device 200 may be used for an electrostatic discharge (ESD) protection circuit, a voltage divider circuit, and a voltage clamper of an integrated circuit (IC), etc.
- ESD protection circuit of an IC a cathode of diode 207 and an anode of diode 210 may be coupled to a solder pad 205 of the IC, and a cathode of diode 212 and an anode of diode 209 may be coupled to a reference voltage 206 of the IC.
- the anti-parallel diode device 200 may perform a voltage clamping function or ESD protection on pad 205 .
- Pad 205 may transmit signals under normal operating conditions in which no static electricity is generated.
- a signal voltage level of pad 205 is higher than a voltage level of reference voltage 206
- the voltage difference between pad 205 and reference voltage 206 should be less than a sum of forward turn-on voltages of diodes 210 - 212 .
- the signal voltage level of pad 205 is lower than the voltage level of reference voltage 206
- the voltage difference between pad 205 and reference voltage 206 should be less than a sum of forward turn-on voltages of diodes 207 - 209 . Therefore, the anti-parallel diode device 200 does not affect a normal operation of the IC.
- an electrostatic pulse When an electrostatic pulse is generated on pad 205 , if the electrostatic pulse is positive, an ESD current may flow from pad 205 to reference voltage 206 through diodes 210 , 211 , and 212 . If the electrostatic pulse is negative, a negative ESD current may flow from pad 205 to reference voltage 206 via diodes 207 , 208 , and 209 .
- diodes 210 - 212 When positive ESD occurs, diodes 210 - 212 are forwardly turned on, diodes 207 - 209 are in reverse-bias states, and voltages at nodes between two adjacent diodes may be uncertain. That is, the voltages across diodes 207 , 208 , and 209 may be unbalanced (or unequal). In this situation, a diode which is having a higher cross-voltage (i.e., a voltage greater than a breakdown voltage) may cause breakdown and damages. On the contrary, when negative ESD occurs, diodes 207 - 209 are forwardly turned on, diodes 210 - 212 are in reverse-bias states.
- the unbalanced cross-voltage problems of diodes 210 - 212 may be analogized with reference to explanation of diodes 207 - 209 , and therefore will not be described hereinafter.
- An embodiment of the invention provides an anti-parallel diode device.
- the anti-parallel diode device includes a first semiconductor, a second semiconductor, a third semiconductor, and a third diode.
- the first semiconductor is of a first conductivity type
- the second semiconductor and the third semiconductor are of a second conductivity type.
- the second semiconductor is in contact with the first semiconductor, so that the first semiconductor and the second semiconductor form a first diode.
- the third semiconductor is in contact with the first semiconductor, so that the first semiconductor and the third semiconductor form a second diode.
- a first terminal of the third diode is electrically connected to the first semiconductor.
- the first terminal of the third diode is of the second conductivity type.
- FIG. 1 is a schematic circuit diagram of an anti-parallel diode device.
- FIG. 2 is a schematic view showing a layout of an anti-parallel diode device according to a first embodiment of the invention.
- FIG. 3 is a schematic view showing an equivalent circuit of the anti-parallel diode device depicted in FIG. 2 according to an embodiment of the invention.
- FIG. 4 is a schematic view showing a layout of an anti-parallel diode device according to a second embodiment of the invention.
- FIG. 5 is a schematic view showing an equivalent circuit of the anti-parallel diode device depicted in FIG. 4 according to an embodiment of the invention.
- FIG. 6 is a schematic view showing a layout of an anti-parallel diode device according to a third embodiment of the invention.
- FIG. 7 is a schematic view showing an equivalent circuit of the anti-parallel diode device depicted in FIG. 6 according to an embodiment of the invention.
- FIG. 8 is a schematic view showing a layout of an anti-parallel diode device according to a fourth embodiment of the invention.
- FIG. 9 is a schematic view showing an equivalent circuit of the anti-parallel diode device depicted in FIG. 8 according to an embodiment of the invention.
- FIG. 10 is a schematic view showing a layout of an anti-parallel diode device according to a fifth embodiment of the invention.
- FIG. 11 is a schematic view showing an equivalent circuit of the anti-parallel diode device depicted in FIG. 10 according to an embodiment of the invention.
- FIG. 12 is a schematic view showing a layout of an anti-parallel diode device according to a sixth embodiment of the invention.
- FIG. 13 is a schematic view showing an equivalent circuit of the anti-parallel diode device depicted in FIG. 12 according to an embodiment of the invention.
- Coupled (or connected) may refer to any direct or indirect connection.
- first device may be directly connected to the second device, or the first device may be indirectly connected to the second device through other devices or other connection means.
- elements/components/steps indicated by the same reference numbers in the drawings and the embodiments are identical or similar elements/components/steps. Descriptions of elements/components/steps indicated by the same reference numbers in different embodiments may be cross-referenced.
- the following embodiments of the invention provide anti-parallel diode devices that may minimize the effect of unbalancing voltage across the diodes in the anti-parallel diode devices.
- FIG. 2 is a schematic view showing a layout of an anti-parallel diode device 300 according to a first embodiment of the invention.
- the layout shown in FIG. 2 is a cross-sectional view.
- This anti-parallel diode device 300 includes semiconductors 321 - 327 .
- Semiconductors 321 , 324 , and 326 are of a first conductivity type (e.g., N-type), and semiconductors 322 , 323 , 325 , and 327 are of a second conductivity type (e.g., P-type).
- the first conductivity type may be a P-type
- the second conductivity type may be an N-type.
- FIG. 3 is a schematic view showing an equivalent circuit of the anti-parallel diode device 300 depicted in FIG. 2 according to an embodiment of the invention.
- Semiconductors 322 and 323 are in contact with semiconductor 321 to form a diode D 31 and a diode D 32 , respectively.
- Semiconductors 322 , 323 , 325 , and 327 may be a base layer of transistor structure and semiconductors 321 , 324 , and 326 may be a collector layer of transistor structure.
- Semiconductors 322 and 323 are both disposed on a same surface of semiconductor 321 , as shown in FIG. 2 . Since diodes D 31 and D 32 share the same semiconductor 321 , an area consumption in the IC may be reduced.
- Semiconductor 325 is in contact with semiconductor 324 to form a diode D 33 .
- a first terminal (e.g., an anode, i.e., semiconductor 325 ) of diode D 33 is electrically connected to semiconductor 321 (second terminals of diodes D 31 -D 32 ) via a connection wire 312 .
- Diodes D 32 -D 33 form a diode string.
- a second terminal of diode D 33 e.g., a cathode, i.e., semiconductor 324
- a first terminal e.g., an anode, i.e., semiconductor 322
- Semiconductor 327 is in contact with semiconductor 326 to form a diode D 34 .
- a first terminal (e.g., an anode, i.e., semiconductor 327 ) of diode D 34 is electrically connected to semiconductor 321 (second terminals of diodes D 31 -D 32 ) via wire 312 .
- Diodes D 34 and D 31 form another diode string.
- a second terminal of diode D 34 e.g., a cathode, i.e., semiconductor 326
- a first terminal e.g., an anode, i.e., semiconductor 323
- semiconductors 322 - 323 disposed on a same surface of semiconductor 321 may be isolated from each other and may not be in contact with each other, and semiconductors 321 , 324 , and 326 disposed on a same surface of a substrate may also be isolated from each other and may not be in contact with each other.
- the anti-parallel diode device 300 may be used for ESD protection circuits, voltage dividers and voltage clampers of IC, etc. Taking ESD protection of the IC as an example, the cathode (semiconductor 326 ) of diode D 34 and the anode (semiconductor 323 ) of diode D 32 may be electrically connected to pad 301 of the IC via wire 311 .
- the cathode (semiconductor 324 ) of diode D 33 and the anode (semiconductor 322 ) of diode D 31 may be electrically connected to reference voltage 302 of the IC via wire 313 .
- Pad 301 may transmit signals under normal operating conditions in which no static electricity is generated.
- a signal voltage level of pad 301 is higher than a voltage level of reference voltage 302
- a voltage difference between pad 301 and reference voltage 302 should be less than a sum of forward turn-on voltages of diodes D 32 and D 33 .
- the voltage difference between pad 301 and reference voltage 302 should be less than a sum of forward turn-on voltages of diodes D 31 and D 34 . Therefore, the anti-parallel diode device 300 does not affect a normal operation of the IC.
- an electrostatic pulse When an electrostatic pulse is generated on pad 301 , if the electrostatic pulse is positive, an ESD current may flow from pad 301 to reference voltage 302 through wire 311 , diode D 32 , wire 312 , diode D 33 , and wire 313 . If the electrostatic pulse is negative, a negative ESD current may flow from pad 301 to reference voltage 302 via wire 311 , diode D 34 , wire 312 , diode D 31 , and wire 313 .
- diodes D 32 -D 33 When ESD causes diodes D 32 -D 33 to be forwardly turned on, diodes D 34 and D 31 are in reverse-bias states. At this time, node N 31 may provide a dividing-voltage potential to node N 32 through the common semiconductor 321 of diodes D 31 -D 32 and wire 312 . Therefore, the anti-parallel diode device 300 may minimize the effect of unbalancing voltages across diodes D 34 and D 31 to avoid damages of diodes D 34 and D 31 . On the contrary, an unbalanced cross-voltage problem of diodes D 32 -D 33 when the diodes are in reverse-bias states may be analogized with reference to the relevant descriptions of diodes D 34 and D 31 and therefore will not be described again.
- FIG. 4 is a schematic view showing a layout of an anti-parallel diode device 500 according to a second embodiment of the invention.
- the layout shown in FIG. 4 is a cross-sectional view.
- the anti-parallel diode device 500 includes semiconductors 521 - 530 .
- Semiconductors 521 , 524 , 526 , and 529 are of a first conductivity type (for example, an N-type, which may be a collector layer of a transistor), and semiconductors 522 , 523 , 525 , 527 , 528 , and 530 are of a second conductivity type (for example, a P-type, which may be a base layer of the transistor).
- the first conductivity type may be a P-type and the second conductivity type may be an N-type.
- FIG. 5 is a schematic view showing an equivalent circuit of the anti-parallel diode device 500 depicted in FIG. 4 according to an embodiment of the invention. Please refer to FIG. 4 and FIG. 5 .
- Semiconductor 522 and 523 are in contact with semiconductor 521 to form diodes D 51 and D 52 , respectively.
- Semiconductors 522 and 523 are both disposed on a same surface of semiconductor 521 as shown in FIG. 4 . Since diodes D 51 and D 52 share the same semiconductor 521 , an area consumption in the IC may be reduced.
- Semiconductor 525 is in contact with semiconductor 524 to form diode D 53 .
- a first terminal (e.g., an anode, i.e., semiconductor 525 ) of diode D 53 is electrically connected to semiconductor 521 (second terminals of diodes D 51 -D 52 ) via wire 513 .
- a second terminal of diode D 53 e.g., a cathode, i.e., semiconductor 524
- a first terminal e.g., an anode, i.e., semiconductor 522
- Semiconductor 526 is electrically connected to semiconductor 523 via wire 512 .
- Semiconductors 527 and 528 are in contact with semiconductor 526 to form diodes D 54 and D 55 , respectively.
- Semiconductor 527 is electrically connected to semiconductor 521 via wire 513 .
- Diodes D 55 , D 52 , and D 53 form a diode string.
- Semiconductors 527 and 528 are both disposed on a same surface of semiconductor 526 , as shown in FIG. 4 . Since diodes D 54 -D 55 share the same semiconductor 526 , an area consumption in the IC may be reduced.
- Semiconductor 530 is in contact with semiconductor 529 to form diode D 56 .
- a first terminal (e.g., an anode, i.e., semiconductor 530 ) of diode D 56 is electrically connected to semiconductor 526 (second terminals of diodes D 54 -D 55 ) via wire 512 .
- Diodes D 56 , D 54 , and D 51 form another diode string.
- a second terminal of diode D 56 e.g., a cathode, i.e., semiconductor 529
- a first terminal e.g., an anode, i.e., semiconductor 528
- semiconductors 522 - 523 disposed on a same surface of semiconductor 521 may be isolated from each other and may not be in contact with each other
- semiconductors 527 - 528 disposed on a same surface of semiconductor 526 may be isolated from each other and may not be in contact with each other
- semiconductors 521 , 524 , 526 , and 529 disposed on a same surface of a substrate may be isolated from each other and may not be in contact with each other.
- the anti-parallel diode device 500 may be used for ESD protection circuits, voltage dividers, and voltage clampers of the IC, etc.
- ESD protection of the IC Taking ESD protection of the IC as an example, the cathode (semiconductor 529 ) of diode D 56 and the anode (semiconductor 528 ) of diode D 55 may be electrically connected to pad 501 of the IC via wire 511 .
- the cathode (semiconductor 524 ) of diode D 53 and the anode (semiconductor 522 ) of diode D 51 may be electrically connected to reference voltage 502 of the IC via wire 514 .
- Pad 501 may transmit signals under normal operating conditions in which no static electricity is generated.
- a voltage difference between pad 501 and reference voltage 502 should be less than a sum of forward turn-on voltages of diodes D 55 , D 52 , and D 53 .
- the voltage difference between pad 501 and reference voltage 502 should be less than a sum of forward turn-on voltages of diodes D 56 , D 54 , and D 51 . Therefore, the anti-parallel diode device 500 does not affect a normal operation of the IC.
- an electrostatic pulse When an electrostatic pulse is generated on pad 501 , if the electrostatic pulse is positive, an ESD current may flow from pad 501 to reference voltage 502 through wire 511 , diode D 55 , wire 512 , diode D 52 , wire 513 , diode D 53 , and wire 514 . If the electrostatic pulse is negative, a negative ESD current may flow from pad 501 to reference voltage 502 via wire 511 , diode D 56 , wire 512 , diode D 54 , wire 513 , diode D 51 , and wire 514 .
- diodes D 56 , D 54 , and D 51 are in reverse-bias states.
- Node N 51 may provide a dividing-voltage potential to node N 52 through the common semiconductor 526 of diodes D 54 -D 55 and wire 512
- node N 53 may provide a dividing-voltage potential to node N 54 through the common semiconductor 521 of diodes D 51 -D 52 and wire 513 . Therefore, the anti-parallel diode device 500 may minimize the effect of unbalancing reverse-bias across diodes D 56 , D 54 , and D 51 to avoid damages to the diodes.
- diodes D 55 , D 52 , and D 53 in reverse-bias states may be analogized with reference to the relevant descriptions of diodes D 56 , D 54 , and D 51 and therefore will not be described again.
- the anti-parallel diode device 500 may provide a wider range of normal operating signal, more divided output voltages, or a higher clamping voltage.
- FIG. 6 is a schematic view showing a layout of an anti-parallel diode device 700 according to a third embodiment of the invention.
- the layout shown in FIG. 6 is a cross-sectional view.
- the anti-parallel diode device 700 includes semiconductors 721 - 730 . In the embodiment shown in FIG.
- semiconductors 721 , 724 , 726 , and 729 are of a first conductivity type (e.g., a P-type, which may be a base layer of a transistor), semiconductors 722 , 727 , and 730 are of a second conductivity type (e.g., an N-type, which may be a collector layer of a transistor), and semiconductors 723 , 725 , and 728 are also of the second conductivity type (e.g., the N-type, which may be an emitter layer of a transistor).
- the first conductivity type may be an N-type
- the second conductivity type may be a P-type.
- FIG. 7 is a schematic view showing an equivalent circuit of the anti-parallel diode device 700 depicted in FIG. 6 according to an embodiment of the invention. Please refer to FIG. 6 and FIG. 7 .
- Semiconductors 722 - 723 are in contact with semiconductor 721 to form diodes D 71 and D 72 , respectively.
- Semiconductor 721 is disposed between semiconductors 722 and 723 as shown in FIG. 6 . Since diodes D 71 and D 72 share the same semiconductor 721 , an area consumption in the IC may be reduced.
- semiconductor 724 is placed on semiconductor 722 .
- Semiconductor 725 is in contact with semiconductor 724 to form diode D 73 .
- a first terminal of diode D 73 e.g., a cathode, i.e., semiconductor 725
- semiconductor 721 second terminals of diodes D 71 -D 72
- a second terminal of diode D 73 e.g., an anode, i.e., semiconductor 724
- a first terminal e.g., a cathode, i.e., semiconductor 722
- Semiconductor 726 is disposed between semiconductors 727 and 728 as shown in FIG. 6 .
- Semiconductors 726 , 727 , and 728 may serve as a base, a collector, and an emitter of a transistor, respectively.
- Semiconductor 726 is electrically connected to semiconductor 723 via wire 712 .
- Semiconductors 727 - 728 are in contact with semiconductor 726 to form diodes D 74 -D 75 , respectively.
- Semiconductor 727 is electrically connected to semiconductor 721 via wire 713 .
- Diodes D 75 , D 72 , and D 73 form a diode string. Since diodes D 74 and D 75 share the same semiconductor 726 , an area consumption in the IC may be reduced.
- Semiconductor 730 is in contact with semiconductor 729 to form diode D 76 .
- a first terminal of diode D 76 e.g., a cathode, i.e., semiconductor 730
- semiconductor 726 second terminals of diodes D 74 -D 75
- Diodes D 76 , D 74 , and D 71 form another diode string.
- a second terminal of diode D 76 (e.g., an anode, i.e., semiconductor 729 ) is electrically connected to a first terminal of diode D 75 (e.g., a cathode, i.e., semiconductor 728 ) via wire 711 .
- semiconductors 721 and 724 disposed on a same surface of semiconductor 722 may be isolated from each other and may not be in contact with each other, and semiconductors 722 , 727 , and 730 disposed on a same surface of a substrate may be isolated from each other and may not be in contact with each other.
- semiconductors 722 , 727 , and 730 may be collector layers and semiconductors 723 , 725 , and 728 may be emitter layers of transistors.
- diodes D 75 , D 72 , and D 73 formed by the base and emitter layers the base-emitter diodes
- diodes D 76 , D 74 , D 71 formed by the base and collector layers have a lower forward turn-on voltages and a higher reverse breakdown voltages.
- Diodes D 76 , D 74 , D 71 and diodes D 75 , D 72 , and D 73 share the same semiconductors and have different forward and reverse electrical characteristics; therefore, an area consumption in the IC may be reduced, and asymmetric voltage clamping design and asymmetric ESD protection design may be achieved.
- FIG. 8 is a schematic view showing a layout of an anti-parallel diode device 900 according to a fourth embodiment of the invention.
- the layout shown in FIG. 8 is a cross-sectional view.
- the anti-parallel diode device 900 includes semiconductors 921 - 936 .
- the first conductivity type may be an N-type
- the second conductivity type may be a P-type.
- FIG. 9 is a schematic view showing an equivalent circuit of the anti-parallel diode device 900 depicted in FIG. 8 according to an embodiment of the invention.
- Semiconductors 922 - 923 are in contact with semiconductor 921 to form diodes D 901 -D 902 , respectively.
- Semiconductor 921 is disposed between semiconductors 922 - 923 as shown in FIG. 8 .
- Semiconductors 921 , 922 , and 923 may serve as a base, a collector, and an emitter of a transistor, respectively. Since diodes D 901 -D 902 share the same semiconductor 921 , an area consumption in the IC may be reduced.
- diode D 906 Semiconductor 927 is placed on and in contact with semiconductor 922 to form diode D 906 . Since diodes D 901 and D 906 share the same semiconductor 922 , an area consumption in the IC may be reduced.
- semiconductor 936 is placed on and in contact with semiconductor 926 to form diode D 903 .
- Semiconductor 924 is in contact with semiconductor 926 to form diode D 905 . Since diodes D 903 and D 905 share the same semiconductor 926 , an area consumption in the IC may be reduced.
- Semiconductor 925 is in contact with semiconductor 924 to form diode D 904 .
- Semiconductor 924 is disposed between semiconductors 925 and 926 as shown in FIG. 8 .
- Semiconductors 924 , 926 , and 925 may serve as a base, a collector, and an emitter of a transistor, respectively. Since diodes D 904 -D 905 share the same semiconductor 924 , an area consumption in the IC may be reduced.
- a first terminal (e.g., a cathode, i.e., semiconductor conductor 926 ) of diode D 903 is electrically connected to semiconductor 921 (second terminals of diodes D 901 -D 902 ) via wire 917 .
- a second terminal of diode D 903 e.g., an anode, i.e., semiconductor 936
- a first terminal e.g., a cathode, i.e., semiconductor 925
- a second terminal (e.g., an anode, i.e., semiconductor 924 ) of diode D 905 is electrically connected to semiconductor 922 (first terminals of diodes D 901 and D 906 ) via wire 916 .
- diodes D 908 -D 909 are placed on and in contact with semiconductor 930 to form diodes D 908 -D 909 , respectively. Since diodes D 908 -D 909 share the same semiconductor 930 , an area consumption in the IC may be reduced.
- Semiconductor 929 is in contact with semiconductor 928 to form diode D 907 .
- Semiconductor 928 is disposed between semiconductors 929 and 930 as shown in FIG. 8 .
- Semiconductors 928 , 930 , and 929 may serve as a base, a collector, and an emitter of a transistor, respectively. Since diodes D 907 -D 908 share the same semiconductor 928 , an area consumption in the IC may be reduced.
- Semiconductor 931 (an anode of diode D 909 ) is electrically connected to semiconductor 923 (a cathode of diode D 902 ) via wire 915 .
- Semiconductor 929 (an cathode of diode D 907 ) is electrically connected to semiconductor 927 (an anode of diode D 906 ) via wire 914 .
- Diodes D 910 and D 912 are placed on and in contact with semiconductor 933 to form diodes D 910 and D 912 , respectively.
- Diodes D 912 , D 907 , D 906 , and D 904 form a diode string. Since diodes D 910 and D 912 share the same semiconductor 933 , an area consumption in the IC may be reduced.
- Semiconductor 934 is in contact with semiconductor 932 to form diode D 911 .
- Diodes D 911 , D 909 , D 902 , and D 903 form another diode string.
- Semiconductor 932 is disposed between semiconductors 933 - 934 as shown in FIG. 8 .
- Semiconductors 932 , 933 , and 934 may serve as a base, a collector, and an emitter of a transistor, respectively. Since diodes D 910 -D 911 share the same semiconductor 932 , an area consumption in the IC may be reduced.
- a first terminal (e.g., a cathode, i.e., semiconductor 933 ) of diode D 912 is electrically connected to semiconductor 928 (second terminals of diodes D 907 -D 908 ) via wire 912 .
- a second terminal of diode D 912 e.g., an anode, i.e., semiconductor 935
- a first terminal of diode D 911 e.g., a cathode, i.e., semiconductor 934
- a second terminal of diode D 910 (e.g., an anode, i.e., semiconductor 932 ) is electrically connected to semiconductor 930 via wire 913 (first terminals of diodes D 908 -D 909 ).
- semiconductors 924 and 936 disposed on a same surface of semiconductor 926 may be isolated from each other and may not be in contact with each other.
- Semiconductors 926 , 922 , 930 , and 933 disposed on the same surface of a substrate may be isolated from each other and may not be in contact with each other.
- the anti-parallel diode device 900 may be used for ESD protection circuits, voltage dividers, and voltage clampers of IC, etc. Taking ESD protection of the IC as an example, the anode of diode D 912 (semiconductor 935 ) and the cathode of diode D 911 (semiconductor 934 ) may be electrically connected to pad 901 of the IC via wire 911 .
- the anode of diode D 903 (semiconductor 936 ) and the cathode of diode D 904 (semiconductor 925 ) may be electrically connected to reference voltage 902 of the IC via wire 918 .
- the anti-parallel diode device 900 may perform a voltage clamping function or ESD protection on pad 901 .
- Pad 901 may transmit signals under normal operating conditions in which no static electricity is generated.
- a signal voltage level of pad 901 is higher than a voltage level of reference voltage 902
- a voltage difference between pad 901 and reference voltage 902 should be less than a sum of forward turn-on voltages of diodes D 912 , D 907 , D 906 , and D 904 .
- the signal voltage level of pad 901 is lower than the voltage level of reference voltage 902
- the voltage difference between pad 901 and reference voltage 902 should be less than a sum of forward turn-on voltages of diodes D 911 , D 909 , D 902 , and D 903 . Therefore, the anti-parallel diode device 900 does not affect a normal operation of the IC.
- an electrostatic pulse When an electrostatic pulse is generated on pad 901 , if the electrostatic pulse is positive, an ESD current may flow from pad 901 to reference voltage 902 through wire 911 , diode D 912 , wire 912 , diode D 907 , wire 914 , diode D 906 , wire 916 , diode D 904 , and wire 918 . If the electrostatic pulse is negative, a negative ESD current may flow from pad 901 to reference voltage 902 via wire 911 , diode D 911 , wire 913 , diode D 909 , wire 915 , diode D 902 , wire 917 , diode D 903 , and wire 918 .
- Node N 91 may provide a dividing-voltage potential to node N 92 through diodes D 908 and/or D 910
- node N 93 may provide a dividing-voltage potential to node N 94 through diodes D 901 and/or D 905 .
- the anti-parallel diode device 900 may minimize the effect of unbalancing reverse-bias across diodes D 911 , D 909 , D 902 , and D 903 to avoid damages to the diodes.
- An unbalanced cross-voltage problem of diodes D 912 , D 907 , D 906 and D 904 may be analogized with reference to the descriptions of diodes D 911 , D 909 , D 902 , and D 903 and therefore will not be described again.
- semiconductors 926 , 922 , 930 , and 933 may be collector layers and semiconductors 925 , 923 , 929 , and 934 may be emitter layers of the transistors.
- diodes D 911 , D 907 , D 902 , and D 904 formed by the base and emitter layers (base-emitter diodes) diodes D 912 , D 909 , D 906 , and D 903 formed by the base and collector layers (base-collector diodes) in this embodiment have lower forward turn-on voltages and higher reverse breakdown voltages.
- the base-emitter diodes and the base-collector diodes are alternately arranged to achieve a symmetrical voltage clamping design and/or a symmetrical ESD design.
- diodes D 911 , D 907 , D 902 , and D 904 and diodes D 912 , D 909 , D 906 , and D 903 share the same semiconductors, so as to reduce an area consumption in the IC.
- the base-collector diodes D 908 , D 910 , D 905 , and D 901 provide dividing voltages of the nodes of the forwardly turned-on diode string to the nodes of another diode string in the reverse-bias state, so that the voltage across the diodes in the reverse-bias states is not excessively large, and damages to the diodes may be avoided.
- FIG. 10 is a schematic view showing a layout of an anti-parallel diode device 1100 according to a fifth embodiment of the invention.
- the layout shown in FIG. 10 is a cross-sectional view.
- the anti-parallel diode device 1100 includes semiconductors 1121 to 1132 .
- semiconductors 1121 , 1124 , 1125 , 1128 , 1129 , and 1132 are of a first conductivity type (for example, a P-type), and semiconductors 1122 , 1123 , 1126 , 1127 , 1130 , and 1131 are of a second conductivity type (for example, an N-type).
- the first conductivity type may be an N-type
- the second conductivity type may be a P-type.
- FIG. 11 is a schematic view showing an equivalent circuit of the anti-parallel diode device 1100 depicted in FIG. 10 according to an embodiment of the invention. Please refer to
- FIG. 10 and FIG. 11 Semiconductor 1122 and 1123 are in contact with semiconductor 1121 to form diodes D 1101 -D 1102 , respectively.
- Semiconductor 1121 is disposed between semiconductors 1122 - 1123 as shown in FIG. 10 .
- Semiconductors 1121 , 1123 , and 1122 may serve as a base, a collector, and an emitter of a transistor, respectively. Since diodes D 1101 -D 1102 share the same semiconductor 1121 , an area consumption in the IC may be reduced.
- Semiconductor 1124 is placed on and in contact with semiconductor 1123 to form diode D 1105 . Since diodes D 1102 and D 1105 share the same semiconductor 1123 , an area consumption in IC may be reduced.
- semiconductors 1129 and 1132 are placed on semiconductor 1131 .
- Semiconductor 1132 is in contact with semiconductor 1131 to form diode D 1104 .
- Semiconductor 1130 is in contact with semiconductor 1129 to form diode D 1103 .
- Semiconductor 1129 is disposed between semiconductors 1130 and 1131 as shown in FIG. 10 .
- Semiconductors 1129 , 1131 , and 1130 may serve as a base, a collector, and an emitter of a transistor.
- a first terminal (e.g., a cathode, i.e., semiconductor 1130 ) of diode D 1103 is electrically connected to semiconductor 1121 (second terminals of diodes D 1101 -D 1102 ) via wire 1115 .
- a second terminal of diode D 1103 e.g., an anode, i.e., semiconductor 1129
- a first terminal e.g., a cathode, i.e., semiconductor 1131
- a second terminal (e.g., an anode, i.e., semiconductor 1132 ) of diode D 1104 is electrically connected to semiconductor 1123 via wire 1114 (first terminals of diodes D 1102 and D 1105 ).
- Diodes D 1107 -D 1108 are placed on and in contact with semiconductor 1127 to form diodes D 1107 -D 1108 , respectively.
- Diodes D 1108 , D 1105 , and D 1104 form a diode string. Since diodes D 1107 -D 1108 share the same semiconductor 1127 , an area consumption in the IC may be reduced.
- Semiconductor 1126 is in contact with semiconductor 1125 to form diode D 1106 .
- Diodes D 1106 , D 1101 and D 1103 form another diode string.
- Semiconductor 1125 is disposed between semiconductors 1126 and 1127 as shown in FIG. 10 .
- Semiconductors 1125 , 1127 , and 1126 may serve as a base, a collector, and an emitter of a transistor, respectively. Since diodes D 1106 -D 1107 share the same semiconductor 1125 , an area consumption in the IC may be reduced.
- a first terminal (e.g., a cathode, i.e., semiconductor 1126 ) of diode D 1106 is electrically connected to semiconductor 1128 (a second terminal of diode D 1108 ) via wire 1111 .
- Semiconductor 1127 (first terminals of diodes D 1107 -D 1108 ) is electrically connected to semiconductor 1124 (an anode of diode D 1105 ) via wire 1112 .
- Semiconductor 1125 (second terminals of diodes D 1106 -D 1107 ) is electrically connected to semiconductor 1122 (a first terminal of diode D 1101 ) via wire 1113 . Further, as shown in FIG.
- semiconductors 1129 and 1132 disposed on a same surface of semiconductor 1131 , semiconductors 1121 and 1124 disposed on a same surface of semiconductor 1123 , and semiconductors 1125 and 1128 disposed on a same surface of semiconductor 1127 may be isolated from each other and are not in contact with each other.
- Semiconductors 1131 , 1123 , and 1127 disposed on the same surface of a substrate may be isolated from each other and are not in contact with each other.
- diodes D 1106 , D 1101 , and D 1103 are forwardly turned on.
- Diodes D 1108 , D 1105 , and D 1104 are in reverse-bias states.
- Node N 111 between diodes D 1103 and D 1101 may provide a dividing-voltage potential to node N 112 between diodes D 1104 and D 1105 through diode D 1102 .
- Node N 113 between diodes D 1101 and D 1106 may provide a dividing-voltage potential to node N 114 between diodes D 1105 and D 1108 through diode D 1107 . Therefore, the anti-parallel diode device 1100 may minimize the effect of unbalancing voltages across diodes D 1104 , D 1105 , and D 1108 to avoid damages to diodes D 1104 , D 1105 , and D 1108 .
- FIG. 12 is a schematic view showing a layout of an anti-parallel diode device 1300 according to a sixth embodiment of the invention.
- the layout shown in FIG. 12 is a cross-sectional view.
- the anti-parallel diode device 1300 includes semiconductors 1321 to 1332 .
- semiconductors 1321 , 1324 , 1325 , 1328 , 1329 , and 1332 are of a first conductivity type (for example, a P-type)
- semiconductors 1322 , 1323 , 1326 , 1327 , 1330 , and 1331 are of a second conductivity type (for example, an N-type).
- the first conductivity type may be an N-type
- the second conductivity type may be a P-type.
- FIG. 13 is a schematic view showing an equivalent circuit of the anti-parallel diode device 1300 depicted in FIG. 12 according to an embodiment of the invention.
- Semiconductor 1322 and 1323 are in contact with semiconductor 1321 to form diodes D 1301 -D 1302 , respectively.
- Semiconductor 1321 is disposed between semiconductors 1322 - 1323 as shown in FIG. 12 .
- Semiconductors 1321 , 1323 , and 1322 may serve as a base, a collector, and an emitter of a transistor, respectively. Since diodes D 1301 -D 1302 share the same semiconductor 1321 , an area consumption in the IC may be reduced.
- Semiconductor 1324 is placed on and in contact with semiconductor 1323 to form diode D 1305 . Since diodes D 1302 and D 1305 share the same semiconductor 1323 , an area consumption in the IC may be reduced.
- semiconductors 1329 and 1332 are placed on semiconductor 1331 .
- Semiconductor 1332 is in contact with semiconductor 1331 to form diode D 1304 .
- Semiconductor 1330 is in contact with semiconductor 1329 to form diode D 1303 .
- Semiconductor 1329 is disposed between semiconductors 1330 and 1331 as shown in FIG. 12 .
- Semiconductors 1329 , 1331 , and 1330 may serve as a base, a collector, and an emitter of a transistor, respectively.
- a first terminal of diode D 1303 (e.g., a cathode, i.e., semiconductor 1330 ) is electrically connected to a second terminal of diode D 1304 (e.g., an anode, i.e., semiconductor 1332 ), second terminals of diodes D 1301 -D 1302 (semiconductor 1321 ), and first terminals of diodes D 1302 and D 1305 (semiconductor 1323 ) via wire 1313 .
- diode D 1304 e.g., an anode, i.e., semiconductor 1332
- second terminals of diodes D 1301 -D 1302 semiconductor 1321
- first terminals of diodes D 1302 and D 1305 semiconductor 1323
- a second terminal of diode D 1303 (e.g., an anode, i.e., semiconductor 1329 ) is electrically connected to a first terminal of diode D 1304 (e.g., a cathode, i.e., semiconductor 1331 ) via wire 1314 .
- diode D 1304 e.g., a cathode, i.e., semiconductor 1331
- Diodes D 1307 -D 1308 are placed on and in contact with semiconductor 1327 to form diodes D 1307 -D 1308 , respectively.
- Diodes D 1308 , D 1305 , and D 1304 form a diode string. Since diodes D 1307 and D 1308 share the same semiconductor 1327 , an area consumption in the IC may be reduced.
- Semiconductor 1326 is in contact with semiconductor 1325 to form diode D 1306 .
- Diodes D 1306 , D 1301 , and D 1303 form another diode string.
- Semiconductor 1325 is disposed between semiconductors 1326 and 1327 as shown in FIG. 12 .
- Semiconductors 1325 , 1327 , and 1326 may serve as a base, a collector, and an emitter of a transistor, respectively. Since diodes D 1306 -D 1307 share the same semiconductor 1325 , an area consumption in the IC may be reduced.
- a second terminal (e.g., a cathode, i.e., semiconductor 1326 ) of diode D 1306 is electrically connected to a first terminal of diode D 1308 (semiconductor 1328 ) via wire 1311 .
- Semiconductor 1327 (second terminals of diodes D 1307 -D 1308 ) is electrically connected to semiconductor 1325 (first terminals of diodes D 1306 -D 1307 ), a first terminal of diode D 1305 (e.g., an anode, i.e., semiconductor 1324 ), and a second terminal of diode D 1301 (e.g., a cathode, i.e., semiconductor 1322 ).
- semiconductors 1329 and 1332 disposed on a same surface of semiconductor 1331 , semiconductors 1321 and 1324 disposed on a same surface of semiconductor 1323 , and semiconductors 1325 and 1328 disposed on a same surface of semiconductor 1327 may be isolated from each other and are not in contact with each other.
- Semiconductors 1331 , 1323 , and 1327 which are disposed on the same surface of a substrate, may be isolated from each other and are not in contact with each other.
- An application and an operating of the anti-parallel diode device 1300 under a normal operation in which no static electricity is generated and in a case of an electrostatic pulse is generated may be analogized with reference to the relevant descriptions of the anti-parallel diode devices 500 , 700 , and 1100 and therefore will not be further described.
- diodes D 1308 , D 1305 , and D 1304 are forwardly turned on, and diodes D 1306 , D 1301 and D 1303 are in reverse-bias states.
- Node N 131 between diodes D 1308 and D 1305 may provide a dividing-voltage potential to node N 132 between diodes D 1306 and D 1301
- node N 133 between diodes D 1305 and D 1304 may provide a dividing-voltage potential to node N 134 between diodes D 1301 and D 1303 . Therefore, the anti-parallel diode device 1300 may minimize the effect of unbalancing voltages across diodes D 1306 , D 1301 , and D 1303 to avoid damages to diodes D 1306 , D 1301 , and D 1303 .
- diodes D 1308 , D 1305 , and D 1304 may be analogized with reference to the relevant descriptions of diodes D 1306 , D 1301 , and D 1303 and therefore will not be further addressed.
- the technologies applied in the manufacturing process of the above-described anti-parallel diode devices 300 , 500 , 700 , 900 , 1100 , and/or 1300 may be determined according to design requirements.
- the technologies may be III-V heterojunction bipolar transistor (HBT) technologies, III-V pseudomorphic high electron mobility transistor (PHEMT) technologies, silicon HBT technologies, silicon-germanium (SiGe) HBT technologies, silicon-on-insulator (SOI) technologies, or any other manufacturing technologies.
- HBT III-V heterojunction bipolar transistor
- PHEMT III-V pseudomorphic high electron mobility transistor
- SiHBT silicon-germanium
- SOI silicon-on-insulator
- the anti-parallel diode device when one side of the anti-parallel diodes is forwardly turned on, two terminals of each diode on the other side have clearly defined reverse voltages to avoid reverse breakdown voltages from becoming turn-on voltages, and a layout area is small.
- the anti-parallel diode device provided in some embodiments of the invention is equipped with two diode strings. When a first diode string is forwardly turned on, a voltage dividing potential of node of the first diode string can control the voltage across the diodes in a second diode string, and vice versa.
- the anti-parallel diode device may minimize the effect of unbalancing voltages across the diodes.
- the layout design of the shared semiconductor and the diodes composed of different semiconductor layers allows the area occupied by the IC to be reduced and achieves a symmetric or asymmetric voltage clamping design and ESD design.
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Abstract
Description
- This application claims the priority benefit of Taiwan application serial no. 107126456, filed on Jul. 31, 2018. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
- This invention relates to a voltage clamping device, and more particularly to an anti-parallel diode device.
-
FIG. 1 is a schematic circuit diagram of ananti-parallel diode device 200. Theanti-parallel diode device 200 includes diodes 207-212. Theanti-parallel diode device 200 may be used for an electrostatic discharge (ESD) protection circuit, a voltage divider circuit, and a voltage clamper of an integrated circuit (IC), etc. Taking ESD protection circuit of an IC as an example, a cathode ofdiode 207 and an anode ofdiode 210 may be coupled to asolder pad 205 of the IC, and a cathode ofdiode 212 and an anode ofdiode 209 may be coupled to areference voltage 206 of the IC. Theanti-parallel diode device 200 may perform a voltage clamping function or ESD protection onpad 205. -
Pad 205 may transmit signals under normal operating conditions in which no static electricity is generated. When a signal voltage level ofpad 205 is higher than a voltage level ofreference voltage 206, the voltage difference betweenpad 205 andreference voltage 206 should be less than a sum of forward turn-on voltages of diodes 210-212. When the signal voltage level ofpad 205 is lower than the voltage level ofreference voltage 206, the voltage difference betweenpad 205 andreference voltage 206 should be less than a sum of forward turn-on voltages of diodes 207-209. Therefore, theanti-parallel diode device 200 does not affect a normal operation of the IC. - When an electrostatic pulse is generated on
pad 205, if the electrostatic pulse is positive, an ESD current may flow frompad 205 toreference voltage 206 throughdiodes pad 205 toreference voltage 206 viadiodes - When positive ESD occurs, diodes 210-212 are forwardly turned on, diodes 207-209 are in reverse-bias states, and voltages at nodes between two adjacent diodes may be uncertain. That is, the voltages across
diodes - An embodiment of the invention provides an anti-parallel diode device. The anti-parallel diode device includes a first semiconductor, a second semiconductor, a third semiconductor, and a third diode. The first semiconductor is of a first conductivity type, and the second semiconductor and the third semiconductor are of a second conductivity type. The second semiconductor is in contact with the first semiconductor, so that the first semiconductor and the second semiconductor form a first diode. The third semiconductor is in contact with the first semiconductor, so that the first semiconductor and the third semiconductor form a second diode. A first terminal of the third diode is electrically connected to the first semiconductor. The first terminal of the third diode is of the second conductivity type.
- In order to make the above-described features of the invention more comprehensible, the following detailed description of the embodiments will be described in detail below.
-
FIG. 1 is a schematic circuit diagram of an anti-parallel diode device. -
FIG. 2 is a schematic view showing a layout of an anti-parallel diode device according to a first embodiment of the invention. -
FIG. 3 is a schematic view showing an equivalent circuit of the anti-parallel diode device depicted inFIG. 2 according to an embodiment of the invention. -
FIG. 4 is a schematic view showing a layout of an anti-parallel diode device according to a second embodiment of the invention. -
FIG. 5 is a schematic view showing an equivalent circuit of the anti-parallel diode device depicted inFIG. 4 according to an embodiment of the invention. -
FIG. 6 is a schematic view showing a layout of an anti-parallel diode device according to a third embodiment of the invention. -
FIG. 7 is a schematic view showing an equivalent circuit of the anti-parallel diode device depicted inFIG. 6 according to an embodiment of the invention. -
FIG. 8 is a schematic view showing a layout of an anti-parallel diode device according to a fourth embodiment of the invention. -
FIG. 9 is a schematic view showing an equivalent circuit of the anti-parallel diode device depicted inFIG. 8 according to an embodiment of the invention. -
FIG. 10 is a schematic view showing a layout of an anti-parallel diode device according to a fifth embodiment of the invention. -
FIG. 11 is a schematic view showing an equivalent circuit of the anti-parallel diode device depicted inFIG. 10 according to an embodiment of the invention. -
FIG. 12 is a schematic view showing a layout of an anti-parallel diode device according to a sixth embodiment of the invention. -
FIG. 13 is a schematic view showing an equivalent circuit of the anti-parallel diode device depicted inFIG. 12 according to an embodiment of the invention. - The term “coupled (or connected)” as used throughout the specification (including claims) may refer to any direct or indirect connection. For instance, if the first device is described as being coupled (or connected) to the second device, it should be construed that the first device may be directly connected to the second device, or the first device may be indirectly connected to the second device through other devices or other connection means. Besides, wherever possible, the elements/components/steps indicated by the same reference numbers in the drawings and the embodiments are identical or similar elements/components/steps. Descriptions of elements/components/steps indicated by the same reference numbers in different embodiments may be cross-referenced.
- The following embodiments of the invention provide anti-parallel diode devices that may minimize the effect of unbalancing voltage across the diodes in the anti-parallel diode devices.
-
FIG. 2 is a schematic view showing a layout of ananti-parallel diode device 300 according to a first embodiment of the invention. The layout shown inFIG. 2 is a cross-sectional view. Thisanti-parallel diode device 300 includes semiconductors 321-327.Semiconductors semiconductors -
FIG. 3 is a schematic view showing an equivalent circuit of theanti-parallel diode device 300 depicted inFIG. 2 according to an embodiment of the invention. Please refer toFIG. 2 andFIG. 3 .Semiconductors semiconductor 321 to form a diode D31 and a diode D32, respectively.Semiconductors semiconductors Semiconductors semiconductor 321, as shown inFIG. 2 . Since diodes D31 and D32 share thesame semiconductor 321, an area consumption in the IC may be reduced. - Semiconductor 325 is in contact with
semiconductor 324 to form a diode D33. A first terminal (e.g., an anode, i.e., semiconductor 325) of diode D33 is electrically connected to semiconductor 321 (second terminals of diodes D31-D32) via aconnection wire 312. Diodes D32-D33 form a diode string. A second terminal of diode D33 (e.g., a cathode, i.e., semiconductor 324) is electrically connected to a first terminal (e.g., an anode, i.e., semiconductor 322) of diode D31 viawire 313.Semiconductor 327 is in contact withsemiconductor 326 to form a diode D34. A first terminal (e.g., an anode, i.e., semiconductor 327) of diode D34 is electrically connected to semiconductor 321 (second terminals of diodes D31-D32) viawire 312. Diodes D34 and D31 form another diode string. A second terminal of diode D34 (e.g., a cathode, i.e., semiconductor 326) is electrically connected to a first terminal (e.g., an anode, i.e., semiconductor 323) of diode D32 viawire 311. Further, as shown inFIG. 2 , semiconductors 322-323 disposed on a same surface ofsemiconductor 321 may be isolated from each other and may not be in contact with each other, andsemiconductors - The
anti-parallel diode device 300 may be used for ESD protection circuits, voltage dividers and voltage clampers of IC, etc. Taking ESD protection of the IC as an example, the cathode (semiconductor 326) of diode D34 and the anode (semiconductor 323) of diode D32 may be electrically connected to pad 301 of the IC viawire 311. The cathode (semiconductor 324) of diode D33 and the anode (semiconductor 322) of diode D31 may be electrically connected toreference voltage 302 of the IC viawire 313. -
Pad 301 may transmit signals under normal operating conditions in which no static electricity is generated. When a signal voltage level ofpad 301 is higher than a voltage level ofreference voltage 302, a voltage difference betweenpad 301 andreference voltage 302 should be less than a sum of forward turn-on voltages of diodes D32 and D33. When the signal voltage level ofpad 301 is lower than the voltage level ofreference voltage 302, the voltage difference betweenpad 301 andreference voltage 302 should be less than a sum of forward turn-on voltages of diodes D31 and D34. Therefore, theanti-parallel diode device 300 does not affect a normal operation of the IC. - When an electrostatic pulse is generated on
pad 301, if the electrostatic pulse is positive, an ESD current may flow frompad 301 toreference voltage 302 throughwire 311, diode D32,wire 312, diode D33, andwire 313. If the electrostatic pulse is negative, a negative ESD current may flow frompad 301 toreference voltage 302 viawire 311, diode D34,wire 312, diode D31, andwire 313. - When ESD causes diodes D32-D33 to be forwardly turned on, diodes D34 and D31 are in reverse-bias states. At this time, node N31 may provide a dividing-voltage potential to node N32 through the
common semiconductor 321 of diodes D31-D32 andwire 312. Therefore, theanti-parallel diode device 300 may minimize the effect of unbalancing voltages across diodes D34 and D31 to avoid damages of diodes D34 and D31. On the contrary, an unbalanced cross-voltage problem of diodes D32-D33 when the diodes are in reverse-bias states may be analogized with reference to the relevant descriptions of diodes D34 and D31 and therefore will not be described again. -
FIG. 4 is a schematic view showing a layout of ananti-parallel diode device 500 according to a second embodiment of the invention. The layout shown inFIG. 4 is a cross-sectional view. Theanti-parallel diode device 500 includes semiconductors 521-530.Semiconductors semiconductors -
FIG. 5 is a schematic view showing an equivalent circuit of theanti-parallel diode device 500 depicted inFIG. 4 according to an embodiment of the invention. Please refer toFIG. 4 andFIG. 5 .Semiconductor semiconductor 521 to form diodes D51 and D52, respectively.Semiconductors semiconductor 521 as shown inFIG. 4 . Since diodes D51 and D52 share thesame semiconductor 521, an area consumption in the IC may be reduced. -
Semiconductor 525 is in contact withsemiconductor 524 to form diode D53. A first terminal (e.g., an anode, i.e., semiconductor 525) of diode D53 is electrically connected to semiconductor 521 (second terminals of diodes D51-D52) viawire 513. A second terminal of diode D53 (e.g., a cathode, i.e., semiconductor 524) is electrically connected to a first terminal (e.g., an anode, i.e., semiconductor 522) of diode D51 viawire 514. -
Semiconductor 526 is electrically connected tosemiconductor 523 viawire 512.Semiconductors semiconductor 526 to form diodes D54 and D55, respectively.Semiconductor 527 is electrically connected tosemiconductor 521 viawire 513. Diodes D55, D52, and D53 form a diode string.Semiconductors semiconductor 526, as shown inFIG. 4 . Since diodes D54-D55 share thesame semiconductor 526, an area consumption in the IC may be reduced. -
Semiconductor 530 is in contact withsemiconductor 529 to form diode D56. A first terminal (e.g., an anode, i.e., semiconductor 530) of diode D56 is electrically connected to semiconductor 526 (second terminals of diodes D54-D55) viawire 512. Diodes D56, D54, and D51 form another diode string. A second terminal of diode D56 (e.g., a cathode, i.e., semiconductor 529) is electrically connected to a first terminal (e.g., an anode, i.e., semiconductor 528) of diode D55 viawire 511. Further, as shown inFIG. 4 , semiconductors 522-523 disposed on a same surface ofsemiconductor 521 may be isolated from each other and may not be in contact with each other, semiconductors 527-528 disposed on a same surface ofsemiconductor 526 may be isolated from each other and may not be in contact with each other, andsemiconductors - The
anti-parallel diode device 500 may be used for ESD protection circuits, voltage dividers, and voltage clampers of the IC, etc. Taking ESD protection of the IC as an example, the cathode (semiconductor 529) of diode D56 and the anode (semiconductor 528) of diode D55 may be electrically connected to pad 501 of the IC viawire 511. The cathode (semiconductor 524) of diode D53 and the anode (semiconductor 522) of diode D51 may be electrically connected toreference voltage 502 of the IC viawire 514. -
Pad 501 may transmit signals under normal operating conditions in which no static electricity is generated. When a signal voltage level ofpad 501 is higher than a voltage level ofreference voltage 502, a voltage difference betweenpad 501 andreference voltage 502 should be less than a sum of forward turn-on voltages of diodes D55, D52, and D53. When the signal voltage level ofpad 501 is lower than the voltage level ofreference voltage 502, the voltage difference betweenpad 501 andreference voltage 502 should be less than a sum of forward turn-on voltages of diodes D56, D54, and D51. Therefore, theanti-parallel diode device 500 does not affect a normal operation of the IC. - When an electrostatic pulse is generated on
pad 501, if the electrostatic pulse is positive, an ESD current may flow frompad 501 toreference voltage 502 throughwire 511, diode D55,wire 512, diode D52,wire 513, diode D53, andwire 514. If the electrostatic pulse is negative, a negative ESD current may flow frompad 501 toreference voltage 502 viawire 511, diode D56,wire 512, diode D54,wire 513, diode D51, andwire 514. - When ESD causes diodes D55, D52, and D53 to be forwardly turned on, diodes D56, D54, and D51 are in reverse-bias states. Node N51 may provide a dividing-voltage potential to node N52 through the
common semiconductor 526 of diodes D54-D55 andwire 512, and node N53 may provide a dividing-voltage potential to node N54 through thecommon semiconductor 521 of diodes D51-D52 andwire 513. Therefore, theanti-parallel diode device 500 may minimize the effect of unbalancing reverse-bias across diodes D56, D54, and D51 to avoid damages to the diodes. On the contrary, an unbalanced cross-voltage problem of diodes D55, D52, and D53 in reverse-bias states may be analogized with reference to the relevant descriptions of diodes D56, D54, and D51 and therefore will not be described again. - Compared to the
anti-parallel diode device 300 of the first embodiment, theanti-parallel diode device 500 may provide a wider range of normal operating signal, more divided output voltages, or a higher clamping voltage. -
FIG. 6 is a schematic view showing a layout of ananti-parallel diode device 700 according to a third embodiment of the invention. The layout shown inFIG. 6 is a cross-sectional view. Theanti-parallel diode device 700 includes semiconductors 721-730. In the embodiment shown inFIG. 6 ,semiconductors semiconductors semiconductors -
FIG. 7 is a schematic view showing an equivalent circuit of theanti-parallel diode device 700 depicted inFIG. 6 according to an embodiment of the invention. Please refer toFIG. 6 andFIG. 7 . Semiconductors 722-723 are in contact withsemiconductor 721 to form diodes D71 and D72, respectively.Semiconductor 721 is disposed betweensemiconductors FIG. 6 . Since diodes D71 and D72 share thesame semiconductor 721, an area consumption in the IC may be reduced. - In the embodiment shown in
FIG. 6 ,semiconductor 724 is placed onsemiconductor 722.Semiconductor 725 is in contact withsemiconductor 724 to form diode D73. A first terminal of diode D73 (e.g., a cathode, i.e., semiconductor 725) is electrically connected to semiconductor 721 (second terminals of diodes D71-D72) viawire 713. A second terminal of diode D73 (e.g., an anode, i.e., semiconductor 724) is electrically connected to a first terminal (e.g., a cathode, i.e., semiconductor 722) of diode D71 viawire 714. -
Semiconductor 726 is disposed betweensemiconductors FIG. 6 .Semiconductors Semiconductor 726 is electrically connected tosemiconductor 723 viawire 712. Semiconductors 727-728 are in contact withsemiconductor 726 to form diodes D74-D75, respectively.Semiconductor 727 is electrically connected tosemiconductor 721 viawire 713. Diodes D75, D72, and D73 form a diode string. Since diodes D74 and D75 share thesame semiconductor 726, an area consumption in the IC may be reduced. -
Semiconductor 730 is in contact withsemiconductor 729 to form diode D76. A first terminal of diode D76 (e.g., a cathode, i.e., semiconductor 730) is electrically connected to semiconductor 726 (second terminals of diodes D74-D75) viawire 712. Diodes D76, D74, and D71 form another diode string. A second terminal of diode D76 (e.g., an anode, i.e., semiconductor 729) is electrically connected to a first terminal of diode D75 (e.g., a cathode, i.e., semiconductor 728) viawire 711. Further, as shown inFIG. 6 ,semiconductors semiconductor 722 may be isolated from each other and may not be in contact with each other, andsemiconductors - An application and an operating principle of the
anti-parallel diode device 700 may be analogized with reference to the relevant descriptions of theanti-parallel diode device 500 and therefore will not be further described. In the present embodiment,semiconductors semiconductors -
FIG. 8 is a schematic view showing a layout of ananti-parallel diode device 900 according to a fourth embodiment of the invention. The layout shown inFIG. 8 is a cross-sectional view. Theanti-parallel diode device 900 includes semiconductors 921-936.Semiconductors semiconductors -
FIG. 9 is a schematic view showing an equivalent circuit of theanti-parallel diode device 900 depicted inFIG. 8 according to an embodiment of the invention. Please refer toFIG. 8 andFIG. 9 . Semiconductors 922-923 are in contact withsemiconductor 921 to form diodes D901-D902, respectively.Semiconductor 921 is disposed between semiconductors 922-923 as shown inFIG. 8 .Semiconductors same semiconductor 921, an area consumption in the IC may be reduced. -
Semiconductor 927 is placed on and in contact withsemiconductor 922 to form diode D906. Since diodes D901 and D906 share thesame semiconductor 922, an area consumption in the IC may be reduced. - In the embodiment shown in
FIG. 8 ,semiconductor 936 is placed on and in contact withsemiconductor 926 to form diode D903.Semiconductor 924 is in contact withsemiconductor 926 to form diode D905. Since diodes D903 and D905 share thesame semiconductor 926, an area consumption in the IC may be reduced. -
Semiconductor 925 is in contact withsemiconductor 924 to form diode D904.Semiconductor 924 is disposed betweensemiconductors FIG. 8 .Semiconductors same semiconductor 924, an area consumption in the IC may be reduced. - A first terminal (e.g., a cathode, i.e., semiconductor conductor 926) of diode D903 is electrically connected to semiconductor 921 (second terminals of diodes D901-D902) via
wire 917. A second terminal of diode D903 (e.g., an anode, i.e., semiconductor 936) is electrically connected to a first terminal (e.g., a cathode, i.e., semiconductor 925) of diode D904 viawire 918. A second terminal (e.g., an anode, i.e., semiconductor 924) of diode D905 is electrically connected to semiconductor 922 (first terminals of diodes D901 and D906) viawire 916. -
Semiconductors semiconductor 930 to form diodes D908-D909, respectively. Since diodes D908-D909 share thesame semiconductor 930, an area consumption in the IC may be reduced. -
Semiconductor 929 is in contact withsemiconductor 928 to form diode D907.Semiconductor 928 is disposed betweensemiconductors FIG. 8 .Semiconductors same semiconductor 928, an area consumption in the IC may be reduced. - Semiconductor 931 (an anode of diode D909) is electrically connected to semiconductor 923 (a cathode of diode D902) via
wire 915. Semiconductor 929 (an cathode of diode D907) is electrically connected to semiconductor 927 (an anode of diode D906) viawire 914. -
Semiconductors semiconductor 933 to form diodes D910 and D912, respectively. Diodes D912, D907, D906, and D904 form a diode string. Since diodes D910 and D912 share thesame semiconductor 933, an area consumption in the IC may be reduced. -
Semiconductor 934 is in contact withsemiconductor 932 to form diode D911. Diodes D911, D909, D902, and D903 form another diode string.Semiconductor 932 is disposed between semiconductors 933-934 as shown inFIG. 8 .Semiconductors same semiconductor 932, an area consumption in the IC may be reduced. - A first terminal (e.g., a cathode, i.e., semiconductor 933) of diode D912 is electrically connected to semiconductor 928 (second terminals of diodes D907-D908) via
wire 912. A second terminal of diode D912 (e.g., an anode, i.e., semiconductor 935) is electrically connected to a first terminal of diode D911 (e.g., a cathode, i.e., semiconductor 934) viawire 911. A second terminal of diode D910 (e.g., an anode, i.e., semiconductor 932) is electrically connected tosemiconductor 930 via wire 913 (first terminals of diodes D908-D909). Further, as shown inFIG. 8 ,semiconductors semiconductor 926,semiconductors semiconductor 922,semiconductors semiconductor 930, andsemiconductors semiconductor 933 may be isolated from each other and may not be in contact with each other.Semiconductors - The
anti-parallel diode device 900 may be used for ESD protection circuits, voltage dividers, and voltage clampers of IC, etc. Taking ESD protection of the IC as an example, the anode of diode D912 (semiconductor 935) and the cathode of diode D911 (semiconductor 934) may be electrically connected to pad 901 of the IC viawire 911. The anode of diode D903 (semiconductor 936) and the cathode of diode D904 (semiconductor 925) may be electrically connected toreference voltage 902 of the IC viawire 918. Theanti-parallel diode device 900 may perform a voltage clamping function or ESD protection onpad 901. -
Pad 901 may transmit signals under normal operating conditions in which no static electricity is generated. When a signal voltage level ofpad 901 is higher than a voltage level ofreference voltage 902, a voltage difference betweenpad 901 andreference voltage 902 should be less than a sum of forward turn-on voltages of diodes D912, D907, D906, and D904. When the signal voltage level ofpad 901 is lower than the voltage level ofreference voltage 902, the voltage difference betweenpad 901 andreference voltage 902 should be less than a sum of forward turn-on voltages of diodes D911, D909, D902, and D903. Therefore, theanti-parallel diode device 900 does not affect a normal operation of the IC. - When an electrostatic pulse is generated on
pad 901, if the electrostatic pulse is positive, an ESD current may flow frompad 901 toreference voltage 902 throughwire 911, diode D912,wire 912, diode D907,wire 914, diode D906,wire 916, diode D904, andwire 918. If the electrostatic pulse is negative, a negative ESD current may flow frompad 901 toreference voltage 902 viawire 911, diode D911,wire 913, diode D909,wire 915, diode D902,wire 917, diode D903, andwire 918. - When ESD causes diodes D912, D907, D906, and D904 to be forwardly turned on, and diodes D911, D909, D902, and D903 are in reverse-bias states. Node N91 may provide a dividing-voltage potential to node N92 through diodes D908 and/or D910, and node N93 may provide a dividing-voltage potential to node N94 through diodes D901 and/or D905. Therefore, the
anti-parallel diode device 900 may minimize the effect of unbalancing reverse-bias across diodes D911, D909, D902, and D903 to avoid damages to the diodes. An unbalanced cross-voltage problem of diodes D912, D907, D906 and D904 may be analogized with reference to the descriptions of diodes D911, D909, D902, and D903 and therefore will not be described again. - In the present embodiment,
semiconductors semiconductors - In the present embodiment, diodes D911, D907, D902, and D904 and diodes D912, D909, D906, and D903 share the same semiconductors, so as to reduce an area consumption in the IC. In the layout design of the shared semiconductors, the base-collector diodes D908, D910, D905, and D901 provide dividing voltages of the nodes of the forwardly turned-on diode string to the nodes of another diode string in the reverse-bias state, so that the voltage across the diodes in the reverse-bias states is not excessively large, and damages to the diodes may be avoided.
-
FIG. 10 is a schematic view showing a layout of ananti-parallel diode device 1100 according to a fifth embodiment of the invention. The layout shown inFIG. 10 is a cross-sectional view. Theanti-parallel diode device 1100 includessemiconductors 1121 to 1132. In the embodiment shown inFIG. 10 ,semiconductors semiconductors -
FIG. 11 is a schematic view showing an equivalent circuit of theanti-parallel diode device 1100 depicted inFIG. 10 according to an embodiment of the invention. Please refer to -
FIG. 10 andFIG. 11 .Semiconductor semiconductor 1121 to form diodes D1101-D1102, respectively.Semiconductor 1121 is disposed between semiconductors 1122-1123 as shown inFIG. 10 .Semiconductors same semiconductor 1121, an area consumption in the IC may be reduced. -
Semiconductor 1124 is placed on and in contact withsemiconductor 1123 to form diode D1105. Since diodes D1102 and D1105 share thesame semiconductor 1123, an area consumption in IC may be reduced. - In the embodiment shown in
FIG. 10 ,semiconductors semiconductor 1131.Semiconductor 1132 is in contact withsemiconductor 1131 to form diode D1104.Semiconductor 1130 is in contact withsemiconductor 1129 to form diode D1103.Semiconductor 1129 is disposed betweensemiconductors FIG. 10 .Semiconductors - A first terminal (e.g., a cathode, i.e., semiconductor 1130) of diode D1103 is electrically connected to semiconductor 1121 (second terminals of diodes D1101-D1102) via
wire 1115. A second terminal of diode D1103 (e.g., an anode, i.e., semiconductor 1129) is electrically connected to a first terminal (e.g., a cathode, i.e., semiconductor 1131) of diode D1104 viawire 1116. A second terminal (e.g., an anode, i.e., semiconductor 1132) of diode D1104 is electrically connected tosemiconductor 1123 via wire 1114 (first terminals of diodes D1102 and D1105). -
Semiconductors semiconductor 1127 to form diodes D1107-D1108, respectively. Diodes D1108, D1105, and D1104 form a diode string. Since diodes D1107-D1108 share thesame semiconductor 1127, an area consumption in the IC may be reduced. -
Semiconductor 1126 is in contact withsemiconductor 1125 to form diode D1106. Diodes D1106, D1101 and D1103 form another diode string.Semiconductor 1125 is disposed betweensemiconductors FIG. 10 .Semiconductors same semiconductor 1125, an area consumption in the IC may be reduced. - A first terminal (e.g., a cathode, i.e., semiconductor 1126) of diode D1106 is electrically connected to semiconductor 1128 (a second terminal of diode D1108) via
wire 1111. Semiconductor 1127 (first terminals of diodes D1107-D1108) is electrically connected to semiconductor 1124 (an anode of diode D1105) viawire 1112. Semiconductor 1125 (second terminals of diodes D1106-D1107) is electrically connected to semiconductor 1122 (a first terminal of diode D1101) viawire 1113. Further, as shown inFIG. 10 ,semiconductors semiconductor 1131,semiconductors semiconductor 1123, andsemiconductors semiconductor 1127 may be isolated from each other and are not in contact with each other.Semiconductors - An application and an operating principle of the
anti-parallel diode device 1100 under a normal operation in which no static electricity is generated and in a case of an electrostatic pulse is generated may be analogized with reference to the relevant descriptions of theanti-parallel diode devices anti-parallel diode device 1100 may minimize the effect of unbalancing voltages across diodes D1104, D1105, and D1108 to avoid damages to diodes D1104, D1105, and D1108. -
FIG. 12 is a schematic view showing a layout of ananti-parallel diode device 1300 according to a sixth embodiment of the invention. The layout shown inFIG. 12 is a cross-sectional view. Theanti-parallel diode device 1300 includessemiconductors 1321 to 1332. In the embodiment shown inFIG. 12 ,semiconductors semiconductors -
FIG. 13 is a schematic view showing an equivalent circuit of theanti-parallel diode device 1300 depicted inFIG. 12 according to an embodiment of the invention. Please refer toFIG. 12 andFIG. 13 .Semiconductor semiconductor 1321 to form diodes D1301-D1302, respectively.Semiconductor 1321 is disposed between semiconductors 1322-1323 as shown inFIG. 12 .Semiconductors same semiconductor 1321, an area consumption in the IC may be reduced. -
Semiconductor 1324 is placed on and in contact withsemiconductor 1323 to form diode D1305. Since diodes D1302 and D1305 share thesame semiconductor 1323, an area consumption in the IC may be reduced. - In the embodiment shown in
FIG. 12 ,semiconductors semiconductor 1331.Semiconductor 1332 is in contact withsemiconductor 1331 to form diode D1304.Semiconductor 1330 is in contact withsemiconductor 1329 to form diode D1303.Semiconductor 1329 is disposed betweensemiconductors FIG. 12 .Semiconductors - A first terminal of diode D1303 (e.g., a cathode, i.e., semiconductor 1330) is electrically connected to a second terminal of diode D1304 (e.g., an anode, i.e., semiconductor 1332), second terminals of diodes D1301-D1302 (semiconductor 1321), and first terminals of diodes D1302 and D1305 (semiconductor 1323) via
wire 1313. A second terminal of diode D1303 (e.g., an anode, i.e., semiconductor 1329) is electrically connected to a first terminal of diode D1304 (e.g., a cathode, i.e., semiconductor 1331) viawire 1314. -
Semiconductors semiconductor 1327 to form diodes D1307-D1308, respectively. Diodes D1308, D1305, and D1304 form a diode string. Since diodes D1307 and D1308 share thesame semiconductor 1327, an area consumption in the IC may be reduced. -
Semiconductor 1326 is in contact withsemiconductor 1325 to form diode D1306. Diodes D1306, D1301, and D1303 form another diode string.Semiconductor 1325 is disposed betweensemiconductors FIG. 12 .Semiconductors same semiconductor 1325, an area consumption in the IC may be reduced. - A second terminal (e.g., a cathode, i.e., semiconductor 1326) of diode D1306 is electrically connected to a first terminal of diode D1308 (semiconductor 1328) via
wire 1311. Semiconductor 1327 (second terminals of diodes D1307-D1308) is electrically connected to semiconductor 1325 (first terminals of diodes D1306-D1307), a first terminal of diode D1305 (e.g., an anode, i.e., semiconductor 1324), and a second terminal of diode D1301 (e.g., a cathode, i.e., semiconductor 1322). Further, as shown inFIG. 12 ,semiconductors semiconductor 1331,semiconductors semiconductor 1323, andsemiconductors semiconductor 1327 may be isolated from each other and are not in contact with each other.Semiconductors - An application and an operating of the
anti-parallel diode device 1300 under a normal operation in which no static electricity is generated and in a case of an electrostatic pulse is generated may be analogized with reference to the relevant descriptions of theanti-parallel diode devices anti-parallel diode device 1300 may minimize the effect of unbalancing voltages across diodes D1306, D1301, and D1303 to avoid damages to diodes D1306, D1301, and D1303. An unbalanced cross-voltage problem of diodes D1308, D1305, and D1304 may be analogized with reference to the relevant descriptions of diodes D1306, D1301, and D1303 and therefore will not be further addressed. - The technologies applied in the manufacturing process of the above-described
anti-parallel diode devices - To sum up, in the anti-parallel diode device provided in one or more embodiments of the invention, when one side of the anti-parallel diodes is forwardly turned on, two terminals of each diode on the other side have clearly defined reverse voltages to avoid reverse breakdown voltages from becoming turn-on voltages, and a layout area is small. Besides, the anti-parallel diode device provided in some embodiments of the invention is equipped with two diode strings. When a first diode string is forwardly turned on, a voltage dividing potential of node of the first diode string can control the voltage across the diodes in a second diode string, and vice versa. Therefore, the anti-parallel diode device may minimize the effect of unbalancing voltages across the diodes. According to one or more embodiments of the invention, the layout design of the shared semiconductor and the diodes composed of different semiconductor layers allows the area occupied by the IC to be reduced and achieves a symmetric or asymmetric voltage clamping design and ESD design.
- It will be apparent to those skilled in the art that various modifications and variations can be made to the structure provided herein without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the disclosure provide modifications and variations provided they fall within the scope of the following claims and their equivalents.
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US11450656B2 (en) | 2022-09-20 |
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